CNN's Erin Burnett on Monday called for Mitt Romney to release more of his tax returns.

Speaking on her show "Outfront," the host said that the only reasons not to do so were evasiveness or stupidity.

Romney has released his 2010 tax return, but has steadfastly refused to release any more of them. This has led to calls even from conservative corners for him to more fully disclose his tax dealings. Columnist George Will, for instance, said on Sunday that it was high time for him to do so.

"If something's going to come out, get it out in a hurry," referencing the idea that Romney sees political peril in the contents of his returns.

In a monologue reminiscent of former CNN host Campbell Brown's "No Bias No Bull" feature, Burnett was blunt with the presumed Republican nominee on Monday.

"It's time, Mitt, time to put them on the table," she said, hoisting up a huge pile of the tax returns Romney has already released. "If he refuses to release them, it is because one, he had a lot more money in tax shelters in prior years than he does now," she continued. "Two, he did something shady. Or, three, he's stupid."

Burnett concluded that she was in the tax shelter camp.

"Let's assume it's number one," she said. "He had a lot of tax shelters, took advantage of every loophole known to man in the 72,536 page IRS tax code."

She added that Romney could use the release of his returns to argue for an overhaul of the code and a tightening of the loopholes.

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WASHINGTON, DC - APRIL 21: Anderson Cooper speaks during a rehearsal before a taping of Jeopardy! Power Players Week at DAR Constitution Hall on April 21, 2012 in Washington, DC. (Photo by Kris Connor/Getty Images)